The Age of the Tetrapod Mastodonsaurus Fauna (Middle Triassic) of the East European Platform: First Data on Radioisotope U–Pb LA-ICP-MS Dating. Article 2. Datings and Sedimentation Model

Silantiev V.V. Kulikova A.V. Novikov I.V. Felker A.S. Miftakhutdinova D.N. Gabdullin R.R. Akhmedenov K.M. Yakupova D.B. Nurieva E.M. Saetgaleeva Y.Y.
August 2025 Pleiades Publishing

Moscow University Geology Bulletin
2025 #80 Issue 4 499 - 510 pp.

Abstract: This article presents the first data on U–Pb LA-ICP-MS radioisotope dating of the Mastodonsaurus tetrapod fauna (Middle Triassic). The radioisotope age (241.6 ± 1.0 Ma) of the deposits, which directly underlie the beds of the Inderian Horizon with Mastodonsaurus fauna in the Kok-Tau section (Caspian basin), indicate that the basement of the Inderian Horizon approximately corresponds to the boundary of the Anisian and Ladinian stages and can be used as an approximate lower age limit of the distribution of this fauna. This radioisotope age, as well as the paleontological data on the Bukobai Horizon of South Urals, allows us to estimate the age of the Mastodonsaurus fauna as entirely Ladinian. A paleogeographic model of sedimentation conditions in the Elton and Inder periods is proposed.

Caspian basin , East European Platform , Middle Triassic , sedimentation model , tetrapod fauna , U–Pb LA-ICP-MS zircon dating

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Kazan (Volga) Federal University, Kazan, 420008, Russian Federation
Branch of the Kazan (Volga) Federal University, Jizzakh, 130000, Uzbekistan
Borisyak Paleontological Institute, Russian Academy of Sciences, Moscow, 117647, Russian Federation
Moscow State University, Moscow, 119991, Russian Federation
West Kazakhstan University, Uralsk, 090000, Kazakhstan

Kazan (Volga) Federal University
Branch of the Kazan (Volga) Federal University
Borisyak Paleontological Institute
Moscow State University
West Kazakhstan University

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